导电聚合物有序超薄膜性质

Properties of ordered conducting polymer ultrathin film

采用修饰多层LB膜的方法制备导电聚合物聚3,4-乙烯二氧噻吩/聚苯乙烯磺酸(PEDOT-PSS)/十八胺(ODA)及硬脂酸(SA)复合层状有序膜。实验表明,PEDOT-PSS纳米粒子对单分子层具有包裹作用,形成了稳定的复合单分子膜;二次离子质谱(SIMS)和小角X射线反射(XRR)分析表明ODA-SA/PEDOT-PSS组装体形成的多层复合膜具有较好的层状结构,单层厚度约为23 nm,这与纳米粒子的尺寸相当;设计了不同的测试结构,测量了复合膜的垂直电导率和水平电导率,研究了薄膜的直流电流-电压特性,采用变程跳跃模型(VRH)对结果进行了拟合,结果表明,三维变程跳跃模型(3D-VRH)可以较好地解释多层膜中载流子的迁移。

A Langmuir-Blodgett（LB）inducing method was firstly used to prepare single layer and multilayer conducting composite PEDOT-PSS film.The film-forming ability of ionization ODA and ODA-SA monolayer spread on PEDOT-PSS nanoparticles subphase and the behavior of ODA/PEDOT-PSS assembly particles on pure water were firstly investigated.The results indicated that PEDOT-PSS nanoparaticles in subphase packed the ionization monolayer to form stable complex Langmuir film was formed at air/water interface.It was found that the best film-forming conditions for composite film were as follows： distinct interface was formed between ODA and PEDOT-PSS layer and single layer thickness of PEDOT-PSS was about 23 nm,which was well in accordance with the size of PEDOT-PSS nanoparticles.Different structures were designed to test the conductive ability of these composite films and a varible range hopping（VRH）model was used to explain the film conductive mechanism.The results indicated that a 3D-VRH model explained well of transferring of charge carrier in multilayer film.